Distribution of rough surface microridges according to acoustic measurement data
Distribution of rough surface microridges according to acoustic measurement data
0.V. Rudenko, Ching Ang Wu
The pressure dependence of the coefficients of reflection of waves of the first and second harmonics from the surface of a pressed contact carries information on the statistical characteristics of the microprotrusion sizes. A model is proposed that represents the contact as an ensemble of springs of variable lengths. A method based on this model is suggested for processing experimental acoustic data. An estimate of the characteristic size is obtained for a surface roughness element, which corresponds to the surface finish class.
Show AbstractThree-channel symmetric accelerometer with common inertial mass
Three-channel symmetric accelerometer with common inertial mass
O.S. Tonakanov
A design of an acceleration pickup comprising three mutually perpendicular reception channels is proposed and its main parameters are described. The pickup can be applied in hydroacoustics and seismometry.
Show AbstractTheory of gravitational field
Theory of gravitational field
A.A. Logunov
Within the framework of special relativity theory, based on the geometrization principle, fundamental equations are derived for gravitational field, which necessarily involve the graviton mass. According to these equations, a homogeneous and isotropic Universe develops cyclically and can only be "planar". The existence of a large "latent" mass of substance in this Universe is predicted. The theory excludes the existence of "black holes".
Show AbstractThe dynamics of circle mapping under a parametric perturbation
The dynamics of circle mapping under a parametric perturbation
A.Yu. Loskutov, S.D. Rybalko
A standard sine mapping of a circle which effectively describes the transition from quasi-periodic motion to chaos in nonlinear systems is considered. For some parameter values corresponding to the chaotic dynamics of this mapping invariant distributions are calculated. It is shown that certain parametric actions on the mapping of a circle being in a chaotic mode result in suppression of chaos, that is, in parametric destochastization.
Show AbstractAnalysis of the energy spectrum of photoneutrons for the $(\gamma, xn)$ reaction within the formalism of statistical multistep compound processes
Analysis of the energy spectrum of photoneutrons for the $(\gamma, xn)$ reaction within the formalism of statistical multistep compound processes
F.A. Zhivopistsev, V.A. Ivanov, S.A. Abdel-Munem
The energy spectra of photoneutrons generated in the $(\gamma, xn)$ reaction on medium and heavy nuclei in the region of dipole giant resonance were analyzed. The analysis was carried out within tl1e framework of the generalized model of multipole giant resonance decay using the formalism of statistical multistep compound processes and allowing for the yield multiplicity. The nucleons were explicitly separated into two types (neutrons and protons). The emission of two neutrons was correctly taken into account. The results of calculations of photoneutron spectra for the nuclei $^{115}In (E_{\gamma}^{max} = 28 MeV)$, $^{181}Та (E_{\gamma}^{max} = 19 MeV)$, and $^{209}Bi (E_{\gamma}^{max} =20 MeV)$ are presented and compared with experiment.
Show AbstractResonance bolometer
Resonance bolometer
G.V. Belokopytov, T.V. Krasyuk
This paper considers characteristics of a resonance bolometer which is an infrared radiation detector depending for its operation on measuring the temperature dependence of parameters of a reactive element connected into a high-Q oscillatory circuit. The optimal pumping and heat removal conditions are determined with consideration for thermal feedback. The voltage-power sensitivity and noise are measured for microwave-pumped bolometers with active elements (cryogenic dielectric resonators made of potassium tantalate and strontium titanate) included in their circuits.
Show AbstractStarting conditions of relativistic carcinotrons with consideration for interaction between the electron beam and the forward wave
Starting conditions of relativistic carcinotrons with consideration for interaction between the electron beam and the forward wave
A.F. Aleksandrov, S.Yu. Galuzo, A.M. Kuznetsov
The interaction of an electron beam with the field of the electrodynamic system of a relativistic carcinotron is analyzed in a linear approximation. Consideration is given not only to the interaction of the electron flux with the field of the (-1 )th space harmonic of a backward wave, but also to the field of the 0th space harmonic of a forward wave. The presence of this wave is due to the carcinotron design, where the microwave energy is taken out towards the electron collector. The effect of interaction with the forward wave on the starting conditions of the oscillator is demonstrated by an example of a concrete mock-up of a relativistic backward-wave tube.
Show AbstractThe minimal noise factor of solid-state gravitational antennas
The minimal noise factor of solid-state gravitational antennas
A.V. Gusev, A.V. Tsyganov
The minimal noise factor of a solid-state gravitational antenna with an arbitrary displacement pickup has been calculated on the basis of electromechanical transformation theory for a realistic model of external effects. A physically achievable algorithm for output signal processing is discussed.
Show AbstractThe amplitude-phase relation for the reflection coefficient of a layered medium
The amplitude-phase relation for the reflection coefficient of a layered medium
A.V. Tikhonravov, I.V. Zuev
Applicability of the Kramers-Kronig relations to the problem of unambiguous reproduction of the amplitude reflection coefficient from the energy reflection coefficient for a layered medium is considered. Examples of nonuniqueness of the solution are given. The conditions necessary for the existence of a one-to-one correspondence between the amplitude and phase of the amplitude reflection coefficient (the conditions for unambiguous reproduction of the amplitude reflection coeffident from the energy one) are determined.
Show AbstractIntraresonator second harmonic generation in lasers with anisotropic resonators
Intraresonator second harmonic generation in lasers with anisotropic resonators
O.E. Nanii, M.R. Paleev
A theoretical model is developed that describes generation of solid-state lasers with intraresonator transformation of radiation into the second harmonic in crystals with type II wave synchronism. Regions of existence of stationary and nonstationary generation modes are studied.
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